US2024865A - Tobacco pipe - Google Patents

Description

Dec. 17, 1935. E. H, MQARDLE 2,024,865

TBAcco PIPE Filed March 15, 1935 ATTORNEY Patented Dec. 17, 1935 UNITED STATES PATENT OFFICE TOBACCO PIPE Application March 15, 1933, Serial No. 660,829

1 Claim. (Cl. 131 -12) My invention relates to an improved tobacco pipe.

An object of the invention is to provide a pipe construction by which the smoke drawn into the smokers mouth from the bowl through the bit will be relatively cool and substantially free of moisture, condensate and other undesirable constituents of the smoke.

Another object is to so construct and correlate the bowl and bit members -that the latter may be used as a cigar or cigarette holder upon removal of the bit from its connection with the bowl.

Other objects of the invention will be apparent from the following description read in connection with the accompanying drawing.

I accomplish these objects by a peculiar interior construction of the bit and shank and by the provision of a fresh air inlet leading to the smoke passage within the pipe.

In the accompanying drawing, which is illustrative of one concrete form the invention may take, Fig. l is a longitudinal substantial central section of my improved pipe, with the several parts assembled in condition for use as a pipe; Fig. 2 is a transverse section on the line 2 2 of Fig, l; Fig. 3 is a longitudinal section of the bit and shank when assembled for use as a cigar or cigarette holder, and Fig. 4 is a similar View of a modified form of shank.

Referring to the drawing I denotes the pipe bowl, II the shank and I2 the bit. These parts are made of any suitable material; the bowl usually being of briar root, meerschaum or clay, the shank of metal, hard rubber or synthetic resin, and the bit of hard rubber or synthetic resin.

The bowl I0 is desirably, although not necessarily, integral with a bowl stem I3 having a central smoke passage I4 terminating in a flare I5 at the end remote from the bowl.

The bowl I0 and shank II are removably connected together in any preferred manner. A desirable form of connection, as shown in Fig. `1 comprises a peripheral undercut groove I6 at the outer end of stem I3 engaged by the inner face of the shank end, which is of annular form. The engagement between the groove I6 and shank wall is in the nature of a friction fit, although other well known forms of air tight connection might be substituted therefor, such as screw threads or taper joints.

The shank II is provided with a chamber I 'I with which the flared end I5 of the smoke passage I4 is in direct communication. The chamber II is of greater size or capacity than the passage I4 and permits of expansion and preliminary cooling of the smoke. The wall of chamber II as it approaches the middle part of the shank II is tapered or contracted in gradual curvature to form the axial passage or orifice I8 which is preferably annular and terminates in the opening Ia.

An air hole or duct I9 is bored through the wall of the shank and leads from atmosphere to 1o a suitable point within the pipe, as for example to the passage I8. The hole I9, which is desirably of very small bore and serves to thoroughly mix indrawn air with smoke, extends radially of the shank axis, or differently expressed, extends substantially at right angles to the longitudinal axis of passage I8.

At the end of passage i3 opposite chamber I1, the shank II is provided with a second charnber which may be of somewhat greater 20 capacity than the chamber I'I. The wall of lchamber 20 embraces an undercut peripheral groove 2I on the bit I2, thus uniting the bit and shank to each other. This connection, like the connection between the shank and bowl stem, is in the nature of a friction ft although other appropriate forms of air tight connection might be used.

Countersunk into the wall of the smoke passage 22 in the bit I2 is part of a tube 23 bent at 30 its end 23a to be out of line with the passage I8. The tube 23 hinders the passage of moisture from the shank to the smokers mouth.

The modified construction of Fig. 4 functions in substantially the same manner as thea form of Fig. 1. In Fig. 4, the interior passages and chambers have substantially the shape of a Venturi tube, the chambers I'Ia and 20a being tapered toward the connecting orifice |31) into which leads the air duct IBa. ff

When the pipe is in use, smoke is drawn from the bowl through the several chambers and passages into the smokers mouth, the smoke flowing in a straight line through the chamber I'I although expanding therein to some extent. As the smoke enters orifice I8 it is mixed with fresh air drawn in through duct I9, and the ow becomes turbulent and continues thus in chamber 20. The admixture of atmospheric air Wit-h the smoke and the turbulent flow in orifice I8 and chamber 20 result in causing excellent cooling of the smoke and the condensation and precipitation out of the smoke of the offensive constituents ordinarily contained in tobacco smoke. The upturned end of tube 23 prevents passage 5s 2 l, n Y ,e

ofV moisture into and through passage 422 and the smoke reaches the smokers mouth in a relatively cool, dry and sweet condition.

By removal of the bowl l0 from the assembly, the shank and bit form a unit, Fig. 3, which Vserves effectively as a cigar or cigarette holder and, during smoking, offers all the advantageous effects obtained with the device when used as a pipe. Y

Should'rcleaning be necessary, it may be readily accomplished by separating the parts from one another and cleaning each in a manner well known in this art.

I claim:-

In a tobacco smoking device, the combination of a bowl and bored stem, the latter having a stricted diameter the end of said oriiiceV in the Y second mentioned chamber being square cornered, there being an air passage leading from atmosphere and opening directly into said orice intermediate its ends.

EDWARD H. MCARDLE.

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